Coil coupling



FIG. 1 is a front, left perspective view of a coil coupling, in an open configuration, showing our new design;

FIG. 2 is the design shown in FIG. 1 in a closed configuration;

FIG. 3 is a front, right perspective view of the design shown in FIG. 2;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

CLAIM The ornamental design for a coil coupling, as shown and described. 